This fridge can operate over a period of 133 hours, or 5.5 days if the guidelines** are meet. divided by.12 volt es 5 amps of electricity (when running)īut.the fridge motor does not need to run all the time, in fact this model indicates it only needs to run about 15% of the time. Therefore a 100ah (amp hour) battery will last for 1000 hours.Ī slightly different example is a 60 watt fridge running on a 12 volt power source uses 60 /12 = 5 amps, but only while the motor runs.Ħ0 watt fridge. A very small user of power is a 1.2 watt LED light running on a 12 volt power source will useġ.2W / 12V = 0.1 amps. If a device specification does not include amps but does include watts, the formula you need is:īelow: An example where we need to calculate the amps. If you use it for 5 mins a day, it could last 120 days. A 100 ah battery should give you (100/10=10) 10 hours of usage. We will get to those after you understand a few more things, but for now we want to know how many amps stuff uses.īelow: A simple example, but heavy user of power is a 12 volt hair dryer rated at 10 amps. It would be nice if this equation held true all the way up to 100 amps for 1 hour, but there are some limits to the maximum rate of current draw, and how much of that 100amps you can actually use without destroying your battery. If you are looking for a battery for a new setup or needing to replace an existing Deep Cycle battery take a look at our related article.Ī 100ah battery should provide 1 amp for 100 hours, 2 amps for 50 hours, 3 amps for 33 hours etc. In the past we recommended the AGM style (Absorbed Glass Mat) as the best for any Recreational Vehicle, but in more recent times as Lithium Batteries have become more affordable we believe the benefit is worth the initial setup costs. It is widely accepted at this stage that Deep Cycle batteries are the best option for RV use. We want to deal in Amps, as that is how the Deep Cycle batteries are rated. If you know one you can calculate the other, provided you know the voltage. The amount of electricity used to run a device or appliance may be defined as watts or as amps. See also a related article: " Everything you need to know about installing solar panels." The aim is not to make it complicated, but to explain it so it makes sense.Ī blank calculation sheet can be downloaded from the end of this article, however we recommend you spend a few minutes reading why and how it works. It will allow you to estimate the size and number of batteries that will suit your camping.Īs always there is a little explanation required to ensure that we are at the same starting point.
If you have a Camper trailer, Caravan or other RV and you like to spend time away from a 240 volt power source, this article will give you some answers that the sales people avoid. 179 Products How long will my RV battery last?
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